Color photography



'spt.1o,"194o. RMLL. 2,214,531

COLOR PHOTOGRAPHY Filed Sep't.v 5. 1938 I Ilunuxxuxi 6 N11 flklxluxll -v XIIXIIIXIIXII V f 11x11; '1111111 l f, Y [inventor Rasmus Kwmck Patented Sept. 10, 1940 PATENT OFFICE 1 lCOLOR PHOTOGRAPHY Reginaldk Killick, Chertsey, England, assignor of one-half tojvCharlesvOak Crisp, London, England' i Application' September 3, 1038, Serial N0. 228,435

, In Great Britain September 3, 1937 1 claim. (c1. sas- 2) This invention relates to color photography and has for its object to provide means by which sensitized films, plates, papers or other surfaces (hereafter termed films, plates or the like) may 5 be manufactured to receive light impressions modifled by color to constitute negatives, such films, plates or the like also if required being utilised to produce corresponding color-modified positives.

-In general, according to the invention, colored glass, preferably pot glass, is reduced to extremely fine particles and such particles of desired and various colors are intimately mixed in required proportions and such mixture of colored glass particles is utilised in the structure of the celluloid or other film, glass or other plate or the like, to form a coating for a surface thereof or form a layer in the section thereof, such .coating or layer insofar as the glass particles are concerned being one particle thick.

The film, plate 'or' the like thus formed has on a suitable surface a panchromatic emulsion susceptible to subsequent chemical treatment so that the light impression received thereon, modified by passing through the coating orlayer of multiple colored glass particles,'when developed and viewed through the film, plate or the like, constitutes an image in the complementary colors.

This may -be suitably treated lngany desired manner, for example in a reversing bath or may be utilised -for the'formation of a dia-positive or for positives as required, the latter being formed from films, plates or Otherwise ymade according to the invention.

35 The mixture ofl colored glass particles forming the coating to one surface of the'film or plate, or the layer included betweentwo other thicknesses to constitute a film Or plate, preferably vis carried by a suitable gelatine, although other suitable material or materials may be used.

In order that the invention may be better understood, it will now be described with reference to the accompanying drawing, in which:

Figs. 1, 2, 3`and 4 showfragmentary sections (highly magnified) of portions of films, plates or the like made according to the invention.

In preferred methods of carrying the invention into effect, the colored glasses to be brought to a finely divided condition (for example 10,000,000 to the square inch), have the following colors: blue-violet, red and green. These, when inthe fine'ly divided condition, are mixed in the proportions of two blue-violet, three red and four green.

55 It will be realised, however, that other colors the glass particles.

may be used and other proportions, as well as other sizes.

The sensitised coating on the film, plate or the like should be so disposed and the said film, plate or the like so used that the light first passes through the thickness or coating of Amixed glass particles before reaching the said sensitised coating.

In practical methods of carrying the invention into effect, it is preferred to use gelatine as the carrier for the glass particles. Such gelatine may be as desired, for example Nelsons Photographic No. 1, shredded or in sheets, This, when suitably prepared, is coated on to the film, plates or otherwise and while of a suitable consistency, that is to say having the required tackiness, has the mixture of glass particles disposed thereon, for example by blowing at regulated and adjustable pressure, by gravity, or otherwise. This coating operation of the glass particles may take place during the controlled passage of the film, plates or the like through a suitable apparatus. The thickness of the gelatine preferably is such that it permits the required penetration of one particle thickness, any excess being removed by shaking, blowing, suction effect, gravity or Otherwise. Where required, suitable hardening means may be employed in connection with the gelatine, such for example as chrome alum, the hardening, however, not taking place until after the coating with Further, hardening may be caused or assisted by exposure to light. Additionally, especially where the coated surface comes on the exterior and does not form a layer between two thicknesses Of glass, film or otherwise, it could be varnished or Otherwise suitably treated to insulate it againstl chemical action or otherwise.

In the method of carrying the invention into effect as indicated in Fig. 1, 5 represents the film, glass or the like which has a gelatine or other suitable coating 6 carrying the vari-colored glass particles l as a unitary layer. 8 is the coating of panchromatic emulsion.

It will be realisedin use that the light passes through the `film, glass or the like in thedirec-l tion of the arrow 9 so that the image produced in the emulsion 8 is modified by passing through the vari-colored glass-particle layer l.

In Fig. 2 the layer of particles 1 is included between two film or glass layers I0 and Il, the panchromatic emulsion 8 being located on the layer l l remote from the light entry 9.

In Fig. 3 the unitary layer I is superposed on the panchromatic coating l carried by the film or the nke s, theiight entry libeingindicated intheflgure. Y. i e

Again, in'Fig. 4 the unitary one surface of the lfilm 5 which receives the light entry 9, the other surfaceV carrying lthe panchromatic emulsion vcoating 8;

. Th panchromatic emulsion (preferably pina-v chrome or pinacyanol dyed) preferably is applied; l

Where possible, to the jlm, plates or Y the` like after the application ofthe glass particle thick.

ness or layer thereto. f

In some cases', to ll any possible ,gaps that l mayA have beenv left not covered by a one-particle l'thickness of the glass particles, the gelatine or f other carrier thereforV is dyed with .a monochrome Y dye similar to one of therco'lors of the'glass used In this way the gelatine'coming in-said gaps can take this dye of one color and the gelatine in the other positions where it carries the glass layer 1 comes on E H y 2,214,531 A y l l Y Spartivc'zles,A beingfilled by such particles, will not The invention isv not limited tothe vprecise formsV or `details-ot'` construction described, as these may be varied .to suit particular cases.v

What 1 claim andv desire to secure byvLetters Patent of the UnitedStates of America is:

Alight-sensitised nlm, plate or the like com- 'prising a transparent ,base, a layer vthereon Aof diierently colored ne' particlesl of pot glass, -the particles lvbeing sufliciently fine to permit of at Y least ten million particles being accommodated in a layerone particle thick and having an area of one square inch,' and the mixture of particlesl consists, of two parts blue-violet, three parts red and four parts green, the layer of particles having a coating ofpanchromatic emulsion.

- v VRLGINALD IKILLICK. 

